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<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     * ========================================<a name="line.2"></a>
<FONT color="green">003</FONT>     * JCommon : a free Java report library<a name="line.3"></a>
<FONT color="green">004</FONT>     * ========================================<a name="line.4"></a>
<FONT color="green">005</FONT>     *<a name="line.5"></a>
<FONT color="green">006</FONT>     * Project Info:  http://www.jfree.org/jcommon/<a name="line.6"></a>
<FONT color="green">007</FONT>     *<a name="line.7"></a>
<FONT color="green">008</FONT>     * (C) Copyright 2000-2006, by Object Refinery Limited and Contributors.<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     * This library is free software; you can redistribute it and/or modify it under the terms<a name="line.10"></a>
<FONT color="green">011</FONT>     * of the GNU Lesser General Public License as published by the Free Software Foundation;<a name="line.11"></a>
<FONT color="green">012</FONT>     * either version 2.1 of the License, or (at your option) any later version.<a name="line.12"></a>
<FONT color="green">013</FONT>     *<a name="line.13"></a>
<FONT color="green">014</FONT>     * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;<a name="line.14"></a>
<FONT color="green">015</FONT>     * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.<a name="line.15"></a>
<FONT color="green">016</FONT>     * See the GNU Lesser General Public License for more details.<a name="line.16"></a>
<FONT color="green">017</FONT>     *<a name="line.17"></a>
<FONT color="green">018</FONT>     * You should have received a copy of the GNU Lesser General Public License along with this<a name="line.18"></a>
<FONT color="green">019</FONT>     * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,<a name="line.19"></a>
<FONT color="green">020</FONT>     * Boston, MA 02111-1307, USA.<a name="line.20"></a>
<FONT color="green">021</FONT>     *<a name="line.21"></a>
<FONT color="green">022</FONT>     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.<a name="line.22"></a>
<FONT color="green">023</FONT>     * in the United States and other countries.]<a name="line.23"></a>
<FONT color="green">024</FONT>     *<a name="line.24"></a>
<FONT color="green">025</FONT>     * ------------<a name="line.25"></a>
<FONT color="green">026</FONT>     * $Id: FastStack.java,v 1.3 2008/09/10 09:22:05 mungady Exp $<a name="line.26"></a>
<FONT color="green">027</FONT>     * ------------<a name="line.27"></a>
<FONT color="green">028</FONT>     * (C) Copyright 2002-2006, by Object Refinery Limited.<a name="line.28"></a>
<FONT color="green">029</FONT>     */<a name="line.29"></a>
<FONT color="green">030</FONT>    <a name="line.30"></a>
<FONT color="green">031</FONT>    package org.jfree.util;<a name="line.31"></a>
<FONT color="green">032</FONT>    <a name="line.32"></a>
<FONT color="green">033</FONT>    import java.io.Serializable;<a name="line.33"></a>
<FONT color="green">034</FONT>    import java.util.Arrays;<a name="line.34"></a>
<FONT color="green">035</FONT>    import java.util.EmptyStackException;<a name="line.35"></a>
<FONT color="green">036</FONT>    <a name="line.36"></a>
<FONT color="green">037</FONT>    /**<a name="line.37"></a>
<FONT color="green">038</FONT>     * A very simple unsynchronized stack. This one is faster than the<a name="line.38"></a>
<FONT color="green">039</FONT>     * java.util-Version.<a name="line.39"></a>
<FONT color="green">040</FONT>     *<a name="line.40"></a>
<FONT color="green">041</FONT>     * @author Thomas Morgner<a name="line.41"></a>
<FONT color="green">042</FONT>     */<a name="line.42"></a>
<FONT color="green">043</FONT>    public final class FastStack implements Serializable, Cloneable {<a name="line.43"></a>
<FONT color="green">044</FONT>        private Object[] contents;<a name="line.44"></a>
<FONT color="green">045</FONT>        private int size;<a name="line.45"></a>
<FONT color="green">046</FONT>        private int initialSize;<a name="line.46"></a>
<FONT color="green">047</FONT>    <a name="line.47"></a>
<FONT color="green">048</FONT>        /**<a name="line.48"></a>
<FONT color="green">049</FONT>         * Creates a new empty stack.<a name="line.49"></a>
<FONT color="green">050</FONT>         */<a name="line.50"></a>
<FONT color="green">051</FONT>        public FastStack() {<a name="line.51"></a>
<FONT color="green">052</FONT>            this.initialSize = 10;<a name="line.52"></a>
<FONT color="green">053</FONT>        }<a name="line.53"></a>
<FONT color="green">054</FONT>    <a name="line.54"></a>
<FONT color="green">055</FONT>        /**<a name="line.55"></a>
<FONT color="green">056</FONT>         * Creates a new empty stack with the specified initial storage size.<a name="line.56"></a>
<FONT color="green">057</FONT>         *<a name="line.57"></a>
<FONT color="green">058</FONT>         * @param size  the initial storage elements.<a name="line.58"></a>
<FONT color="green">059</FONT>         */<a name="line.59"></a>
<FONT color="green">060</FONT>        public FastStack(int size) {<a name="line.60"></a>
<FONT color="green">061</FONT>            this.initialSize = Math.max(1, size);<a name="line.61"></a>
<FONT color="green">062</FONT>        }<a name="line.62"></a>
<FONT color="green">063</FONT>    <a name="line.63"></a>
<FONT color="green">064</FONT>        /**<a name="line.64"></a>
<FONT color="green">065</FONT>         * Returns &lt;code&gt;true&lt;/code&gt; if the stack is empty, and &lt;code&gt;false&lt;/code&gt;<a name="line.65"></a>
<FONT color="green">066</FONT>         * otherwise.<a name="line.66"></a>
<FONT color="green">067</FONT>         *<a name="line.67"></a>
<FONT color="green">068</FONT>         * @return A boolean.<a name="line.68"></a>
<FONT color="green">069</FONT>         */<a name="line.69"></a>
<FONT color="green">070</FONT>        public boolean isEmpty() {<a name="line.70"></a>
<FONT color="green">071</FONT>            return this.size == 0;<a name="line.71"></a>
<FONT color="green">072</FONT>        }<a name="line.72"></a>
<FONT color="green">073</FONT>    <a name="line.73"></a>
<FONT color="green">074</FONT>        /**<a name="line.74"></a>
<FONT color="green">075</FONT>         * Returns the number of elements in the stack.<a name="line.75"></a>
<FONT color="green">076</FONT>         *<a name="line.76"></a>
<FONT color="green">077</FONT>         * @return The element count.<a name="line.77"></a>
<FONT color="green">078</FONT>         */<a name="line.78"></a>
<FONT color="green">079</FONT>        public int size() {<a name="line.79"></a>
<FONT color="green">080</FONT>            return this.size;<a name="line.80"></a>
<FONT color="green">081</FONT>        }<a name="line.81"></a>
<FONT color="green">082</FONT>    <a name="line.82"></a>
<FONT color="green">083</FONT>        /**<a name="line.83"></a>
<FONT color="green">084</FONT>         * Pushes an object onto the stack.<a name="line.84"></a>
<FONT color="green">085</FONT>         *<a name="line.85"></a>
<FONT color="green">086</FONT>         * @param o  the object.<a name="line.86"></a>
<FONT color="green">087</FONT>         */<a name="line.87"></a>
<FONT color="green">088</FONT>        public void push(Object o) {<a name="line.88"></a>
<FONT color="green">089</FONT>            if (this.contents == null) {<a name="line.89"></a>
<FONT color="green">090</FONT>                this.contents = new Object[this.initialSize];<a name="line.90"></a>
<FONT color="green">091</FONT>                this.contents[0] = o;<a name="line.91"></a>
<FONT color="green">092</FONT>                this.size = 1;<a name="line.92"></a>
<FONT color="green">093</FONT>                return;<a name="line.93"></a>
<FONT color="green">094</FONT>            }<a name="line.94"></a>
<FONT color="green">095</FONT>    <a name="line.95"></a>
<FONT color="green">096</FONT>            final int oldSize = this.size;<a name="line.96"></a>
<FONT color="green">097</FONT>            this.size += 1;<a name="line.97"></a>
<FONT color="green">098</FONT>            if (this.contents.length == this.size) {<a name="line.98"></a>
<FONT color="green">099</FONT>                // grow ..<a name="line.99"></a>
<FONT color="green">100</FONT>                final Object[] newContents = new Object[this.size<a name="line.100"></a>
<FONT color="green">101</FONT>                        + this.initialSize];<a name="line.101"></a>
<FONT color="green">102</FONT>                System.arraycopy(this.contents, 0, newContents, 0, this.size);<a name="line.102"></a>
<FONT color="green">103</FONT>                this.contents = newContents;<a name="line.103"></a>
<FONT color="green">104</FONT>            }<a name="line.104"></a>
<FONT color="green">105</FONT>            this.contents[oldSize] = o;<a name="line.105"></a>
<FONT color="green">106</FONT>        }<a name="line.106"></a>
<FONT color="green">107</FONT>    <a name="line.107"></a>
<FONT color="green">108</FONT>        /**<a name="line.108"></a>
<FONT color="green">109</FONT>         * Returns the object at the top of the stack without removing it.<a name="line.109"></a>
<FONT color="green">110</FONT>         *<a name="line.110"></a>
<FONT color="green">111</FONT>         * @return The object at the top of the stack.<a name="line.111"></a>
<FONT color="green">112</FONT>         */<a name="line.112"></a>
<FONT color="green">113</FONT>        public Object peek() {<a name="line.113"></a>
<FONT color="green">114</FONT>            if (this.size == 0) {<a name="line.114"></a>
<FONT color="green">115</FONT>                throw new EmptyStackException();<a name="line.115"></a>
<FONT color="green">116</FONT>            }<a name="line.116"></a>
<FONT color="green">117</FONT>            return this.contents[this.size - 1];<a name="line.117"></a>
<FONT color="green">118</FONT>        }<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>        /**<a name="line.120"></a>
<FONT color="green">121</FONT>         * Removes and returns the object from the top of the stack.<a name="line.121"></a>
<FONT color="green">122</FONT>         *<a name="line.122"></a>
<FONT color="green">123</FONT>         * @return The object.<a name="line.123"></a>
<FONT color="green">124</FONT>         */<a name="line.124"></a>
<FONT color="green">125</FONT>        public Object pop() {<a name="line.125"></a>
<FONT color="green">126</FONT>            if (this.size == 0) {<a name="line.126"></a>
<FONT color="green">127</FONT>                throw new EmptyStackException();<a name="line.127"></a>
<FONT color="green">128</FONT>            }<a name="line.128"></a>
<FONT color="green">129</FONT>            this.size -= 1;<a name="line.129"></a>
<FONT color="green">130</FONT>            final Object retval = this.contents[this.size];<a name="line.130"></a>
<FONT color="green">131</FONT>            this.contents[this.size] = null;<a name="line.131"></a>
<FONT color="green">132</FONT>            return retval;<a name="line.132"></a>
<FONT color="green">133</FONT>        }<a name="line.133"></a>
<FONT color="green">134</FONT>    <a name="line.134"></a>
<FONT color="green">135</FONT>        /**<a name="line.135"></a>
<FONT color="green">136</FONT>         * Returns a clone of the stack.<a name="line.136"></a>
<FONT color="green">137</FONT>         *<a name="line.137"></a>
<FONT color="green">138</FONT>         * @return A clone.<a name="line.138"></a>
<FONT color="green">139</FONT>         */<a name="line.139"></a>
<FONT color="green">140</FONT>        public Object clone() {<a name="line.140"></a>
<FONT color="green">141</FONT>            try {<a name="line.141"></a>
<FONT color="green">142</FONT>                FastStack stack = (FastStack) super.clone();<a name="line.142"></a>
<FONT color="green">143</FONT>                if (this.contents != null) {<a name="line.143"></a>
<FONT color="green">144</FONT>                    stack.contents = (Object[]) this.contents.clone();<a name="line.144"></a>
<FONT color="green">145</FONT>                }<a name="line.145"></a>
<FONT color="green">146</FONT>                return stack;<a name="line.146"></a>
<FONT color="green">147</FONT>            }<a name="line.147"></a>
<FONT color="green">148</FONT>            catch (CloneNotSupportedException cne) {<a name="line.148"></a>
<FONT color="green">149</FONT>                throw new IllegalStateException("Clone not supported? Why?");<a name="line.149"></a>
<FONT color="green">150</FONT>            }<a name="line.150"></a>
<FONT color="green">151</FONT>        }<a name="line.151"></a>
<FONT color="green">152</FONT>    <a name="line.152"></a>
<FONT color="green">153</FONT>        /**<a name="line.153"></a>
<FONT color="green">154</FONT>         * Clears the stack.<a name="line.154"></a>
<FONT color="green">155</FONT>         */<a name="line.155"></a>
<FONT color="green">156</FONT>        public void clear() {<a name="line.156"></a>
<FONT color="green">157</FONT>            this.size = 0;<a name="line.157"></a>
<FONT color="green">158</FONT>            if (this.contents != null) {<a name="line.158"></a>
<FONT color="green">159</FONT>                Arrays.fill(this.contents, null);<a name="line.159"></a>
<FONT color="green">160</FONT>            }<a name="line.160"></a>
<FONT color="green">161</FONT>        }<a name="line.161"></a>
<FONT color="green">162</FONT>    <a name="line.162"></a>
<FONT color="green">163</FONT>        /**<a name="line.163"></a>
<FONT color="green">164</FONT>         * Returns the item at the specified slot in the stack.<a name="line.164"></a>
<FONT color="green">165</FONT>         *<a name="line.165"></a>
<FONT color="green">166</FONT>         * @param index  the index.<a name="line.166"></a>
<FONT color="green">167</FONT>         *<a name="line.167"></a>
<FONT color="green">168</FONT>         * @return The item.<a name="line.168"></a>
<FONT color="green">169</FONT>         */<a name="line.169"></a>
<FONT color="green">170</FONT>        public Object get(final int index) {<a name="line.170"></a>
<FONT color="green">171</FONT>            if (index &gt;= this.size) {<a name="line.171"></a>
<FONT color="green">172</FONT>                throw new IndexOutOfBoundsException();<a name="line.172"></a>
<FONT color="green">173</FONT>            }<a name="line.173"></a>
<FONT color="green">174</FONT>            return this.contents[index];<a name="line.174"></a>
<FONT color="green">175</FONT>        }<a name="line.175"></a>
<FONT color="green">176</FONT>    }<a name="line.176"></a>




























































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